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我想在 Xcode 4.5.2 for iOS 中创建一个 NSURLConnection 委托，因为文档建议这样做。现在我将以下代码（直接取自文档）放入我的 AppDelegate.m 方法中application didFinishLaunchingWithOptions:。

// Create the request.
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/"]
                        cachePolicy:NSURLRequestUseProtocolCachePolicy
                    timeoutInterval:60.0];
// create the connection with the request
// and start loading the data
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection) {
    // Create the NSMutableData to hold the received data.
    // receivedData is an instance variable declared elsewhere.
    receivedData = [[NSMutableData data] retain];
} else {
    // Inform the user that the connection failed.
}

如何在 AppDelegate.h 中创建委托？我在哪里以及如何声明变量receivedData？

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1 回答 1

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您不应该在 AppDelegate 中执行此操作，而只是为了使其工作，这就是您需要执行的操作。

1) 在您的 AppDelegate.h 中，将接口声明替换为 ::

@interface AppDelegate : UIResponder <UIApplicationDelegate, NSURLConnectionDataDelegate> {
    NSMutableData *receivedData;
}

2) 在您的 AppDelegate.m 中，添加此方法 ::

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [receivedData setData:data];
    NSLog(@"receivedData : %@", receivedData);
}
于 2013-01-31T21:52:27.403 回答